One of the features used by APF to prevent address spoofing is that it filters reserved IP address space, also known as BOGON filtering. This is an otherwise very reliable method to keep out random unallocated spoofed addresses from injecting traffic towards your server, assuming of course the list is updated regularly.

We decided a few months ago that we would disable by default all remote features in APF, including the auto updating of the reserved networks file (BOGON filter list), however this was done with one ill-fated consequence… That if you do not turn on the update feature yourself you More >